document.write( "Question 1025555: Find the sum of the first 8 terms of the sequence.
\n" ); document.write( "1, -3, -7, -11, ...
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Algebra.Com's Answer #640840 by MathTherapy(10552)\"\" \"About 
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\n" ); document.write( "Find the sum of the first 8 terms of the sequence.
\n" ); document.write( "1, -3, -7, -11, ...
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This is an AP with d (common difference) = - 4, and the 1st term, or \"a%5B1%5D+=+1\".
\n" ); document.write( "Use the formula for the sum of an AP: \"S%5Bn%5D+=+%28n%2F2%29%282a%5B1%5D+%2B+%28n+-+1%29d%29\" to get the sum of the 1st 8 terms. By the way, n = 8 \n" ); document.write( "
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